“Apple has not responded to inquiries regarding whether an app with a cryptocurrency mining feature was in violation of App Store guidelines” writes Jeremy Horwitz for venturebeat.com. Until Calendar 2, the Mac App Store had not featured an app with a cryptocurrency unlock option.However, the app has since vanished, leaving it unclear whether the mining feature violated the App Store’s terms.In recent months, Cisco and Adblock Plus have fought against surreptitious cryptocurrency mining installations by hackers, while Monetizr and Aura have sought to use either cryptocurrency or a computer’s mining resources to pay for in-app content.